Pump-regulator.



B. KR A MER.

PUMP REGULATOR.

APPLICATION rum) Mn 21, 1913.

1,106,949, Patented Aug. 11, 19m

Witness 5: Inventor:

X, BernQar-d Krimer",

W ov-neg UNITED W-E BERNHARD KRAMER, 0F CHARLOTTENBURG, GERMANY, ASSIGNOR W10 GENERAL ELECTRIC COMPANY, A CORPORATION OF N'El/V YORK.

PUMP-REGULATOR.

Specification of Letters Patent.

Patented Aug. 11, 1914.

Application filed May 21, 1913. Serial No. 768,945.

To all whom it may concern Be it known that I, BERNHARD KRAMER, a subject of the Emperorof Germany, residing at Charlottenburg, Germany, have invented certain new and useful Improvements in Pump-Re ulators, of which the following is a speci cation.

This invention relates to reciprocating pumps which are required to deliver a varying quantity of liquid without varying the.

stroke of the plunger. Heretofore such pumps have been regulated by a centrifugal affected by centrifugal force to change itsposition with reference to its axis of revolution and thus vary its efl'ect upon the valve, on which it operates directly.

In the accompanying drawing, Figure 1 is a longitudinal section through the pump; Fig. 2 is a cross section on the line 2 2, Fig. 1; and Fig. 3 is a similar cross section showing a modification- The pump consists of a plun er piston 1 working in a cylinder 2 and actlng to draw liquid from a suction chamber 3 through a suction valve 4 into a pump chamber 5, from which it is discharged through a check valve 6 into a pipe 7. The plunger receives its forcing stroke from a cam 8 on a rotating shaft 9 and is withdrawn for the suction stroke by a spring'lO abutting a collar 11 on the plunger. The suction valve4 is normally held to its seat by a spring 12 abutting a collar 13 on'the spindle 14 of said valve. The spring yields at each suction stroke of the pump to permit liquid to flow from the suction chamber 3 into'the pump chamber 5. Mounted on the shaft 9 is a member 15 adapted to move radially in a carrier 16. The plane of revolution .of the member is in line with the axis of the spindle 14. A spring 17 restrains said member from moving outwardly under the influence of centrifugal force so long'as the speed of the pump remains normal. But should it in crease in speed above a predetermined value, so that the delivery of liquid exceeds the desired amount to meet the load requirements, then the member slides outwardly and becomes a cam which at each revolution depresses the suction valve during a portion of the forcing stroke of the plunger. This enables a portion of the liquid to flow back into the suction chamber and lessens by this amount the quantity forced into the pipe 7 The exact amount thus returned to the suction chamber depends upon the speed of the shaft and the extent to which the cam 15 is projected from its carrier, and

possible upon the spindle when the speed is high, two leaves 18 are pivoted to the carrier on opposite sides of the cam, and are kept yieldingly in contact with it by means of a connecting spring 19. When the rounded nose of the cam pushes out between these leaves, they lie oneach side and form an inclined approach to it. Thus it will be seen that said leaves 18 also function as cams, being in effect a part of the cam member 15.

In Fig. 3, the suction valve is pressed to its seat by a spring 20 located underneath it. In line with its spindle 14 is an actuator 21 which is connected by a pitman 22 with a wrist pin 23 mounted loosely in a radial slot 24 in a crank disk 25 and urged normally toward the axis of the disk by a spring 26. Under the influencev of centrifugal force, however, the pin will move outward in its slot and thus automatically increase its throw and consequently the stroke of the actuator until the latter can operate tohold open the valve 4 during more or less of the forcing stroke of the pump.

The invention is of especial service in feed pumps for engines, such as fuel pumps for high compression internal combustion engines, for which it may serve as a speed regulator, by controlling the supply of liquid fuel delivered to the engine.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof; but I desire to have it understood that the apparatus shownis only illustrative, and that the invention can be carried out by other means.

What I claim as new and desire to secure by Letters Patent of the United States, is

1. The combination with a pump having a suction chamber and a pump chamber, of aself-closing suction valve controlling the flow of liquid between said chambers, a rotating element, and a radially movable device having a cam surface carried by said element, said cam surface acting directly on the spindle of said valve to hold itopen during a definite portion of the forcing stroke of said pump depending on the speed of the rotatpump having tating shaft, a carrier-on said shaft, a cam member radially movable in said carrier and adapted to make contact with the spindle of said valve at abnormalspeeds, and pivoted leaves on each side of said member which cooperate therewith to form continuations of the cam surface thereof. a

' 4. In a pump, the combination of a cylinder, a plunger therefor, self-closing suction and discharge valves for the cylinder, a stem for the suction valve, a shaft which actuates the plunger a holder mounted on the shaft,

a member carried by theholder and in position to act on the valve stem to vary the time of closing of the valve, said member moving away from the axis of the shaftin response to changes in centrifugal force, and a spring for opposing the outward movement of the weight.

In witness whereof, have hereunto set my hand this 19th day of April, 1913.

' V BERNHARD KRAMER.

'Witnesses: 1'

FRANZ GRANN,

HEINRICH DEoHAMPs. 

